On Wed, Jan 8, 2020 at 1:26 PM Bernd Petrovitsch <bernd@xxxxxxxxxxxxxxxxxxx> wrote: > > Hi all! > > On 08/01/2020 19:09, Jeffrey Walton wrote: > [...] > > I work with an open source project. We have a VM but it is low-end. > > The machine suffers OOM kills. We don't have access to /etc/fstab. > > Apparently you run too many (or too fat) programs;-) > > > Everything is an upsell with the VPS provider. > > > > I'm trying to setup a swapfile during startup using Systemd but: > > > > # swapon /swapfile > > swapon: /swapfile: swapon failed: Operation not permitted > > > > This may be useful: > [... nope ....] > > > My question is, is there a way to sidestep the restriction? Is it > > possible to ask the kernel to use the swapfile without using the > > command? > > The swapon (and swapoff) command basically calls the swapon() > syscall (and swapoff() syscall, respectively) and their manual > page say the caller needs CAP_SYS_ADMIN capability which usually > means being "root". > > Does it work in a root-shell? No, it does not work in a root shell. The output is capsh is below. The man page for capsh(1) does not tell me how to interpret it. Does cap_sys_admin under "current" mean I have it? Or does lack of cap_sys_admin in "bounding" mean I lack it? Jeff # capsh --print Current: = cap_chown,cap_dac_override,cap_dac_read_search,cap_fowner,cap_fsetid,cap_kill,cap_setgid,cap_setuid,cap_setpcap,cap_linux_immutable,cap_net_bind_service,cap_net_broadcast,cap_net_admin,cap_net_raw,cap_ipc_lock,cap_ipc_owner,cap_sys_chroot,cap_sys_ptrace,cap_sys_admin,cap_sys_boot,cap_sys_nice,cap_sys_resource,cap_sys_tty_config,cap_mknod,cap_lease,cap_audit_write,cap_setfcap+eip Bounding set =cap_chown,cap_dac_override,cap_dac_read_search,cap_fowner,cap_fsetid,cap_kill,cap_setgid,cap_setuid,cap_setpcap,cap_linux_immutable,cap_net_bind_service,cap_net_broadcast,cap_net_raw,cap_ipc_lock,cap_ipc_owner,cap_sys_chroot,cap_sys_ptrace,cap_sys_boot,cap_sys_nice,cap_sys_resource,cap_sys_tty_config,cap_mknod,cap_lease,cap_audit_write,cap_audit_control,cap_setfcap Securebits: 00/0x0/1'b0 secure-noroot: no (unlocked) secure-no-suid-fixup: no (unlocked) secure-keep-caps: no (unlocked) uid=0(root) gid=0(root) groups=0(root) _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
